Passive vibration isolation of a mould cooling fan used in a glass package manufacturing factory

The undesirable vibrations occur due to the unbalanced forces which occurs due to the working conditions of the machines used in the industry. If these vibrations exceed the permissible limits they can damage the equipments of the machine, cause the other sensitive machines near it not to work properly and also adversely affect human health. To eliminate these negative effects, the vibration isolation is done between the ground and the machine. Isolation type and material must be chosen properly to prevent the high amplitude vibration on the machines. For this, the dynamic properties of the system that includes the machine and isolation material should be determined. In this thesis, the isolation efficiency of isolators used for the passive isolation of the fan which are used to cool the molds in the glass industry is examined. For this purpose, the natural frequencies of the system are determined first by deriving the equations of the system under rigid body assumption. For the different fan speeds and isolator numbers the transmissibility graphics are plotted and the isolation efficiency in percent are calculated and presented in the tables. Moreover, the equations of the motion are modeled in the state space and solved numerically by using Matlab and the vibration responses of the system determined due to unbalanced forces are given with graphs. The RMS values of the vibration are also calculated and presented in the tables. It is founded that, for a successful vibration isolation it is appropriate to use the minimum number of isolators provided that the static deflections of the isolators are under the limits.